Fire extinguishing system



May 20, 19 R. KURTH 2,242,399 FIRE EXTINGUISHING SYSTEM Filed May 2, 1959 In venior Allorne y s Patented May 20, 1941 Application May 2, 1939, Serial No. 271,257 In Germany M3115]! 16, 1936 a 1 Claim.

The invention relates .to a fire extinguishing systemof the type employing carbon dioxide which .is discharged through a rest'ricted orifice and a special shield from a container of liquid carbon dioxide to transform the liquid into car bon dioxide snow.

The liquid carbon dioxide is commonly stored in steel containers under high pressure. As the capacity of such steel containers is limited it is necessary to provide a-great number of such containers in order to produce snow in sufiicient quantities when desired. This requirement, the

transport; as well as the attaching and detaching of the fiasks to and from the snow ing shields cause costs and loss of time.

The object ofthe invention is'to avoid such inconveniences and especially the danger caused by loss of time or insufiicient stock of carbon dioxide.

One form of theinvention is illustrated in the accompanying drawing which shows a side elevation partly broken away of a carbon dioxide snow extinguisher embodying the invention.

In the drawing there is shown at .a container adapted to hold a charge'of liquid carbon dioxide. At the upper end the container I has a charging opening! with removable closure means 3 for filling it with solid carbon dioxide blocks producoxide must bear such a proportion that Withthe vaporizing of the carbon dioxide caused in a very short time by the heat passing through the metallic wall of the container, the triple point (60.88

lb. per 'sq. inch) is exceeded and therefore the solid carbon dioxide is converted into liquid carbon dioxide. It is important to obtain liquid carbon dioxide/because only liquid carbon di-' oxide can be transformed into snow which is 4. Such solid carbon dioxide blocks can on a needed in fire extinguishing.

The carbon dioxide is discharged from the container I through 'a conduit formed by. the siphon tube 5 extending to the bottom of the container I, a flexible hose and a snow producing shield I. The siphon tube 5 is arranged near the inner wall of the container i so that it does not hinder the filling of the containerwith solid carbon dioxide blocks. The end of the siphon tube 5 is provided with. a discharging valve 8.

I claim: v

The method of dispens'ng carbon dioxide snow as a fire extinguishing medium, which comprises confining solid carbon. dioxide in an air tightw space in suflicient quantity with respect to the spaceso as to develop a pressure greater than 60.88 lbs. per square inch, allowing the solid car- I bon dioxide to melt and vaporize and thereby carbon dioxide snow.

RUDOLF KiiRTH; 

